Grinding-mill.



K. O. S. THURS.

\ GRINDING MILL. AJPPLIOATION FILED OCT. 27, 1909.

975,807. Patented Nov. 15, 1910.

THE NORRIS PETERS co., WASHINGTON, u. c,

KARL OTTO SAMUEL THORS, .OF STOCKHOLM, SWEDEN, ASSIGNOR TO A. KARLSONMETALL & MASKIN .AKTIETBOLAG, OF STOCKHOLM, SWEDEN.

GRINDING-MILL.

Specification of Letters Patent.

Patented Nov. 15, 1910.

Application filed October 27, 1909. Serial No. 524,864.

To all whom it may concern:

Be it known that I, KARL OTTO SAMUEL THORS, engineer, citizen of Sweden,residing at Stockholm, Vasagatan 7, Sweden, have invented certain newand useful Improvements in Gi-inclingMills; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

The object of my present invention is a feeding device for rotaryapparatus such as centrifugal machines, bolters, crushing andpulverizing machines and the like with inclined or horizontal shaft, inwhich solid substances are treated.

The improvement relates to a stationary chute arranged in thefeed-opening by means of which the substance conducted into the machineis equally distributed in the rotary cylinder so that stagnation isprevented.

In feed-devices for rapidly rotating inclined or horizontal grindingmachines hitherto known a stagnation of the material is easily caused,as the latter, if not fed in quite evenly, will form a rotary-body inthe rotary-cylinder, even if the latter is provided with pretty largeopenings for admitting the material between the grinding-disks. In thisway the new material, which is fed into the machine, is prevented frompassing between the disks. In order to prevent this stagnation and toequally distribute the material a nonrotating chute is arranged in theopening of the apparatus, said chute being constructed in such a waythat the material is equally distributed in the machine.

In the annexed drawing a longitudinal section of the device is shownapplied to a grinding-machine.

According to the embodiment shown on the drawing the grinding machineconsists of two series of grinding disks 0 and d respectively, which arearranged in pairs and movable with relation to each other. The two disks0 and cl in each pair converge outwardly against each other and areprovided with teeth, thus grinding or pulverizing the material passingoutwardly between themselves. The disks are secured to a rotary centralcylinder 6, into which the material is fed and which is provided withopenings e at its periphery, leading the material between the grindingdisks 0 (Z. The cylinder 6 is rotated by means of the shaft f, andprovided with screws 9. The disks d are bound together by means of screw-bolts 7L and sleeves j and secured to a rotary shaft is surrounding androtated in opposite directions to the shaft 7. The disks (Z do notextend to the periphery of the cylinder 6, but spaces are left betweensaid disks d and the cylinder for the insertion of packing rings Z.

A stationary chute a consists of an annular outer part which is fixed inthe inlet opening 0 of the casing 37 and of an integral inner part pwhich projects into the interior of cylinder 5 and is of a taperingscoop form nearly as broad in its largest part as the said interior. Thebottom of the inner part of this scoop lies along the bottom line ofsaid cylinder. The inclination of the side edges of said inner part ofthe chute approximates the natural inclination of the grain or othermaterial fed in through said chute but is slightly less than the maximumheight of the latter. The material fed into the chute a flows over itsedges and is thus distributed over the whole interior surface of therotary cylinder 6, even if the rotary cylinder is of considerablelength. In View of the edges of the chute sloping against the side wallof the cylinder as indicated the quantity of material falling down onthe cylinder 5 is the same along the whole cylinder.

Claim:

In combination with a fixed cylinder provided with an inlet opening inits side and grinding mechanism secured to an inner wall thereof, rotarygrinding mechanism within said casing comprising a rotary cylinderhaving an open end and openings in its periphery and provided withgrinding disks, and a horizontal chute fixed in said inlet opening in afixed cylinder and extending into the end opening into said rotarycylinder and having an inwardly extending tapering scoop-form portionarranged parallel to andslightly above the bottom of the interior nameto this specification in the presence of of said cylinder, theinclinatioi offit?l edges i two subscribing witnesses. at roximatin thatof the b0 0' t e matcii ial which e nters through said chute but KARLOTTO SAMUEL THORS' 5 low enough to permit this material to spillWitnesses:

over said sides substantially as set forth. ANNA S6DERSTR6M,

In testimony whereof, I have signed my HARRY ALBIHN.

